Oh, I'm sorry, I guess I should have explained better. BYOB is an offshot of
Scratch and is also implemented in Squeak. You can download the current
version (3.0.8) at http://byob.berkeley.edu (it comes with the complete
changes and sources files, and with a .bat that opens it in development
mode).

Here's how to get the plugin into Scratch: 

1) download and install BYOB
2) open BYOB in development mode (use the .bat)
3) shift-click on EDIT and select "turn fill screen off"
4) click on the background to get the Squeak World menu
5) open a browser, file out class SystemPlugin
6) quit BYOB, open a Scratch dev image and file in class SystemPlugin
7) Save the Scratch dev image and quit it
8) copy SystemPlugin.dll from the BYOB folder to your Scratch dev folder
9) Again launch your Scratch dev image and refer to the examples in the
class method #primLaunch:

Good luck!
--Jens
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